Primary strainer for cellulose wood pulp, etc.



May 9 c. M. HANSSEN PRIMARY STRAINER FOR CELLULOSE, WOOD PULP, ETC'Filed Nov. 1a, 1926 Patented May 24, 1927;

UNITED STATES" PATENT, orric'e.

cnRrsrmN MARTIN Russian, or MJONDALEN, NORWAY, assrenoR m 4 8. 'rnunnsmax. vnnxsrnn; or sxornn, NEAR osno, NORWAY.

PRIMARY STBAINER roR CELIlULOSE'. woon rung, are.

Application filed November 18, 1926, Serial No. 149,224, and in NorwayNovember 26, 1925.

The most usually employed knot catchers for cellulose are only to asmall degree lenient in their treatment of the knots. Particurlarly thisis true of theft pes in which 5 the knots are collected in t e: interior.of

rotatin drums.

By t e present invention the inventor has succeeded in providing anapparatus for continuously removing the knots in the cel- \0 lulosewithout thelatter being in any way injured by a too hard treatment, andat the same time the knots are nevertheless, before they are removedfrom the machine, washed quite clean from adhering cellulose fibres.

i Further the new apparatus, in addition to its simple constructlon,ossesses also'the great advantage that nothing of the height of the pulplevel is lost. The machineis arranged directly in the horizontal pulpchannel and therefore, both regarding floor area and building height, itresults in a space-saving solution of the problem, and at the same timeits expenditure of power is quite minimal, because the same is re--stricted to the power required for moving the grating slowl against thepulp stream. The drawing il ustrates diagrammatically an embodiment ofthe invention, Figure '1 being a longitudinal section and Figure 2 across section of, the

strainer apparatus not-catcher). The

. catching gratings 2 are attached to a shaft 3 rotating transversely tothe pulp chann el 1. These gratings comprise a great number of parallelyattached bars s aced suitably apart in order to 'catchthe ot's, whereasthe cellulose is allowed to'pass throu h without any hindrance.Obviously nothing prevents the use of other means for straining 40 thepulp than the bar-shaped gratings here indicated. Thus the use of forinstance a perforated or slotted plate may be suggested."

against the shaft and be collected in the primary or coarse vcharacterized by channel-shaped flow. between the fastening rlbsof thebars. When'the rating'arrives at its uppermost position, t is channel isaxially swept b a strong rinsing jet from the nozzle 4. his water. jettransports the collected and cleansed knots out to the side, where it iscollected by the fund 5 and conducted away.

In order to prevent any ulp from passing the apparatus unstrained, t echannel is rovidcd witha recessed portion correspon ing 'to the outermoving radius of the gratings The recessed portion is made so-large thatall the pulp passing through the supply channel must passthrough at'least one grating.

Claims.

1 Coarse-straining a paratus for sorting cellulose, wood pulp an thelike comprising a pulp channel, a scooping wheel, the shaft of which isarran ed transversely to the pulp channel and t e scoopsof which aremade as coarse strains or ratings corresponding approximately to t ecross section of the pulp. channel, so that the scoops during theirmovement through the pulp in the pulp channel sweep with them knots andimpurities but allow' the fine pulp to pass.

2. Apparatus as. set forth in' claim 1, characterized by thisthat-transversely to the pul channel a rinsing pi e is arranged whichrinses the knots inwardli towards the shaft, where they are. collecte inthe channel-shaped portion between two scoops.

3. Apparatus as set forth in claim 1,

scooping whee to the side out from the channel between two scoops, whenthe latter are in their uppermost position or approximately so.

4. Apparatus asset ,f rth in claim, 1, characterized by this-that thepulp channel, at the place where the scooping wheel is arrange isprovided with a. recessed portion following the largest /radius' of thescoops.

In testimony whereof I have signed my name to this specification.

CHRISTIAN MARTIN HANSSEN.

this that at one side of the near the shaft a rinsing nozzle 1s arrangedwhich sweeps the knots

